lol yeah but not everyone can afford a Time Capsule. No offense but why do Mac users always say "i just use my (insert very expensive product here)" lol. I have actually tallied up the costs of what i use (non-apple) vs Apple. Using Apple i would have never been able to afford my Mustang. srsly i would have had to use a cheap moped that hopes to do 45mph. But Apple products are high for a reason...i guess. OUrr local scrap yard has just as many macs as they do PCs.
for pc there are Home network storage units that work the same as time capsule. Most work with iTunes and such, for only $200 for 3tb storage. My god Time capsule can get up to $600!!!! why? why so high? oh well. Also yes these will work with other backup programs, heck windows 7 has one built in that does pretty well. Never had a problem.
anyhoo. the main thing is backup. if you have a lil pentium 3 (dont know if older macs can network in like this) laying around and extra outlets u can network it in for backup as well for a quick cheap sort of "greenish" solution. Buy a cheap external drive case and put the largest drive you have in it. basically Make your own Tank.